Implement ZeroizeOnDrop for SHA 1..=2 and Blake2 #852

Job	Run time
cross (1.51, aarch64-unknown-linux-gnu, default)	4m 3s
cross (1.51, aarch64-unknown-linux-gnu, default)	4m 3s
simd	5m 45s
simd	5m 45s
cross (1.51, powerpc-unknown-linux-gnu, default)	6m 2s
cross (1.51, powerpc-unknown-linux-gnu, default)	6m 2s
cross (stable, aarch64-unknown-linux-gnu, default)	46s
cross (stable, aarch64-unknown-linux-gnu, default)	46s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 3s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 3s
minimal-versions / minimal-versions	48s
minimal-versions / minimal-versions	1m 3s
set-msrv / set-msrv	3s
set-msrv / set-msrv	3s
build (1.41.0, thumbv7em-none-eabi)	5m 38s
build (1.41.0, thumbv7em-none-eabi)	5m 38s
build (1.41.0, wasm32-unknown-unknown)	3m 47s
build (1.41.0, wasm32-unknown-unknown)	3m 47s
test (1.41.0)	4m 21s
test (1.41.0)	4m 21s
build (stable, thumbv7em-none-eabi)	21s
build (stable, thumbv7em-none-eabi)	21s
test (stable)	38s
test (stable)	38s
build (stable, wasm32-unknown-unknown)	33s
build (stable, wasm32-unknown-unknown)	33s
	1h 7m 51s

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